Model comparison
MiMo-V2-Pro vs Step 3.5 Flash
MiMo-V2-Pro and Step 3.5 Flash score almost the same on the Noometry Index (42.4 vs 41.7), so choose on price, context window or the category you care about most.
Last verified . 18 shared benchmarks.
StepFunSummary
- They share 18 benchmarks with published results for both. MiMo-V2-Pro scores higher in 6 categories and Step 3.5 Flash in 2 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where MiMo-V2-Pro leads 62.9 to 59.0.
- Step 3.5 Flash is cheaper at $0.10 / $0.30 per million input/output tokens, against $0.43 / $0.87 for MiMo-V2-Pro.
- MiMo-V2-Pro accepts more context: 1.05M tokens versus 256K.
- Step 3.5 Flash has downloadable open weights; the other is API-only.
Side by side
| MiMo-V2-Pro | Step 3.5 Flash | |
|---|---|---|
| Provider | Xiaomi | StepFun |
| Noometry Index | 42.4 | 41.7 |
| Released | 2026-03-18 | 2026-01-29 |
| Weights | Proprietary | Open |
| Context window | 1.05M | 256K |
| Max output | 131K | 256K |
| Input $ / M tokens | $0.43 | $0.10 |
| Output $ / M tokens | $0.87 | $0.30 |
| Results tracked | 23 | 19 |
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Category by category
Coding MiMo-V2-Pro leads
MiMo-V2-Pro: 43.4 (#76), Step 3.5 Flash: 41.7 (#106)
| Benchmark | MiMo-V2-Pro | Step 3.5 Flash |
|---|---|---|
| LMArena Coding | 1476 | 1436 |
| LMArena WebDev | 1433 | — |
| ALE-Bench | 785.17 | — |
Reasoning Too close to call
MiMo-V2-Pro: 21.3 (#200), Step 3.5 Flash: 21.2 (#202)
| Benchmark | MiMo-V2-Pro | Step 3.5 Flash |
|---|---|---|
| NYT Connections (extended) | 25.8% | 28.4% |
| LMArena Hard Prompts | 1457 | 1411 |
| Thematic Generalization | 45.9% | — |
Math Step 3.5 Flash leads
MiMo-V2-Pro: 36.7 (#104), Step 3.5 Flash: 40.6 (#77)
| Benchmark | MiMo-V2-Pro | Step 3.5 Flash |
|---|---|---|
| LMArena Math | 1447 | 1408 |
| MathArena Final-Answer Competitions | — | 66.8% |
Knowledge MiMo-V2-Pro leads
MiMo-V2-Pro: 40.8 (#106), Step 3.5 Flash: 39.0 (#127)
| Benchmark | MiMo-V2-Pro | Step 3.5 Flash |
|---|---|---|
| LMArena Expert | 1479 | 1422 |
Multilingual MiMo-V2-Pro leads
MiMo-V2-Pro: 52.9 (#77), Step 3.5 Flash: 50.7 (#115)
| Benchmark | MiMo-V2-Pro | Step 3.5 Flash |
|---|---|---|
| LMArena Non-English | 1416 | 1386 |
| LMArena Chinese | 1455 | 1448 |
| LMArena French | 1470 | 1421 |
| LMArena German | 1417 | 1404 |
| LMArena Japanese | 1366 | 1353 |
| LMArena Korean | 1401 | 1350 |
| LMArena Russian | 1427 | 1385 |
| LMArena Spanish | 1458 | 1419 |
Instruction Following MiMo-V2-Pro leads
MiMo-V2-Pro: 76.2 (#46), Step 3.5 Flash: 73.3 (#119)
| Benchmark | MiMo-V2-Pro | Step 3.5 Flash |
|---|---|---|
| LMArena Instruction Following | 1444 | 1385 |
Long Context Step 3.5 Flash leads
MiMo-V2-Pro: 41.5 (#133), Step 3.5 Flash: 42.8 (#112)
| Benchmark | MiMo-V2-Pro | Step 3.5 Flash |
|---|---|---|
| LMArena Longer Query | 1455 | 1402 |
| CL-bench | 15.7% | — |
| CL-bench Life | 6.9% | — |
Writing & Preference MiMo-V2-Pro leads
MiMo-V2-Pro: 62.9 (#67), Step 3.5 Flash: 59.0 (#108)
| Benchmark | MiMo-V2-Pro | Step 3.5 Flash |
|---|---|---|
| LMArena Text | 1436 | 1403 |
| LMArena Creative Writing | 1415 | 1357 |
| LMArena Multi-Turn | 1456 | 1405 |
Frequently asked questions
Is MiMo-V2-Pro better than Step 3.5 Flash?
MiMo-V2-Pro and Step 3.5 Flash score almost the same on the Noometry Index (42.4 vs 41.7), so choose on price, context window or the category you care about most.
Which is cheaper, MiMo-V2-Pro or Step 3.5 Flash?
Step 3.5 Flash is cheaper. It lists at $0.10 per million input tokens and $0.30 per million output tokens; MiMo-V2-Pro lists at $0.43 and $0.87.
Is MiMo-V2-Pro or Step 3.5 Flash better for coding?
MiMo-V2-Pro scores higher on coding benchmarks: 43.4 versus 41.7 in the Noometry coding category.
Which has the bigger context window?
MiMo-V2-Pro does, with 1.05M tokens against 256K.
How many benchmarks do MiMo-V2-Pro and Step 3.5 Flash share?
18 benchmarks have published results for both models. MiMo-V2-Pro has 23 scored results on Noometry and Step 3.5 Flash has 19.